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Highly siderophile element abundances in Eoarchean komatiite and basalt protoliths

Frank, Elizabeth A., Maier, Wolfgang and Mojzsis, Stephen J. 2016. Highly siderophile element abundances in Eoarchean komatiite and basalt protoliths. Contributions to Mineralogy and Petrology 171 (3) , 29. 10.1007/s00410-016-1243-y

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Abstract

Plume-derived, Mg-rich, volcanic rocks (komatiites, high-Mg basalts, and their metamorphic equivalents) can record secular changes in the highly siderophile element (HSE) abundances of mantle sources. An apparent secular time-dependent enrichment trend in HSE abundances from Paleoarchean to Paleoproterozoic mantle-derived rocks could represent the protracted homogenization of a Late Veneer chondritic contaminant into the pre-Late Veneer komatiite source. To search for a possible time dependence of a late accretion signature in the Eoarchean mantle, we report new data from rare >3700 Myr-old mafic and ultramafic schists locked in supracrustal belts from the Inukjuak domain (Québec, Canada) and the Akilia association (West Greenland). Our analysis shows that some of these experienced HSE mobility and/or include a cumulate component (Touboul et al. in Chem Geol 383:63–75, 2014), whereas several of the oldest samples show some of the most depleted HSE abundances measured for rocks of this composition. We consider these new data for the oldest documented rocks of komatiite protolith in light of the Late Veneer hypothesis.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Earth and Ocean Sciences
Subjects: Q Science > QE Geology
Publisher: SpringerLink
ISSN: 0010-7999
Date of Acceptance: 17 February 2016
Last Modified: 05 Jul 2019 15:07
URI: http://orca.cf.ac.uk/id/eprint/91749

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